Nushell 0.36: Tutor Expansion, New Commands, and Dataframe Improvements

2nd chunk of `blog/2021-08-24-nushell_0_36.md`

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We've only added a few topics so far, but we hope to grow these topics (with your help) over the coming releases.

## New commands and features

- [`drop nth`](https://github.com/nushell/nushell/pull/3917) - drops the given rows (andrasio)
- [`PROMPT_STRING` environment variable](https://github.com/nushell/nushell/pull/3918) - configures the script to run to create the prompt directly from the environment (elferherrera)
- [`zip`](https://github.com/nushell/nushell/pull/3919) - combine two lists into one list of pairs (andrasio)

## Dataframe improvements (elferherrera)

- [datetime commands](https://github.com/nushell/nushell/pull/3894)

Title: Nushell 0.36: Tutor Expansion, New Commands, and Dataframe Improvements

Summary

The Nushell 0.36 release includes the addition of a few topics to the built-in tutor. The release also includes new commands and features, such as `drop nth`, `PROMPT_STRING` environment variable, and `zip`. Dataframe improvements, particularly datetime commands, have also been implemented.